7075 aluminum delivers higher ultimate strength and hardness, with zinc as its primary alloying element, making it the preferred choice for applications that demand maximum strength, such as critical aerospace structures. In contrast, 2024 aluminum, which is mainly alloyed with copper, offers superior fatigue performance and easier machinability. This makes it especially suitable for aircraft components that require excellent formability and long-term stress endurance, even though its strength is slightly lower. The main distinctions between the two alloys are found in strength (7075 > 2024), principal alloying element (Zn vs. Cu), corrosion behavior (7075 performs better), and cost (7075 is generally more expensive).
7075 Aluminum (Supplied by GNEE)
Primary Alloying Element: Zinc (Zn)
Strength: Exceptionally high strength, with the best strength-to-weight ratio; harder than 2024
Fatigue Resistance: Good, though typically lower fatigue endurance than 2024
Corrosion Resistance: Moderate; protective treatments such as cladding or coatings are recommended
Machinability: Good
Typical Applications: Aerospace high-stress components, defense equipment, and high-performance structures where maximum strength is essential
2024 Aluminum (Supplied by GNEE)
Primary Alloying Element: Copper (Cu)
Strength: High strength, but lower than 7075
Fatigue Resistance: Excellent, often outperforming 7075 in fatigue endurance
Corrosion Resistance: Relatively lower; higher copper content increases corrosion susceptibility
Machinability: Superior to 7075, easier to machine and form
Typical Applications: Aircraft structures such as fuselages, wing skins, ribs, rivets, truck wheels, and certain marine components
Which Alloy Should You Choose?
Select 7075 aluminum when your application requires the highest possible strength and hardness, and when higher cost and the need for corrosion protection are acceptable trade-offs.
Choose 2024 aluminum when excellent fatigue life, better machinability, and cost efficiency are more important, particularly for aircraft skins and structural parts that require good workability.
It's understandable that you're not sure which of the 2024 and 7075 aluminum options is superior. Both alloys are well-known for their high strength, thus they may be appropriate for a project if that is the only concern.
But when it comes to specifics, things start to shift. For example, if you want an alloy with stronger stress and stain resistance, we recommend 7075 aluminum. If your project requires a high level of cyclic fatigue resistance, utilize 2024 aluminum.
The 2024 aluminum is mostly made up of aluminum, copper, and magnesium. The 7075 aluminum is mostly made up of aluminum, zinc, and copper.
They are all hard alloys and are commonly used in airplane parts. However, 2024 aluminum is not popular in ordinary industries.